Stove or furnace



(No Model.) 2 Sheets-Sheet l'.

A. ENGSTRAND, A. D. SU'NDEEN, J. C. POPE 8v R, W. SAFFOR'D. sTovE 0R FURNAGE.

t MMJQZQ 898.

(No Model.) 2 Sheets-Sheet 2.

A. ENGSTRAND, A. D. SUNDEEN, J. G. POPE 8c R. W. SAFFORD. s'roVE 0R- P-URNAGB.

.c. we wams PETER: co. Hom-nwo., vasi-mman D UNITEDY STATES PATENT Triton.

AUGUST ENGSTRAND, ALFRED D. SUNDEEN, JACOB O. POPE, AND ROGER W.

SAFFORD, OF MORA, MINNESOTA.

SPECIFICATION forming part of Letters Patent No. 601,437, dated March 29, 1898. Application filed March 10, 1897. Serial No. 626,819. (No model.)

To all whom, it may concern:

Be it known that we, AUGUST ENGSTRAND, ALFRED D. SUNDEEN, JACOB C. POPE, and ROGER W. SAFFORD, citizens of the United States, residing at Mora, in the county of Kanabec and State of Minnesota, have invented a new and useful Stove and Furnace, of which the following is a specification.

This invention relates to certain improvements in stoves and furnaces for heating purposes, and has for its Object to provide a device of this character of a simple and inexpensive nature having an improved and simpliiied arrangement of interior partitions and iiues designed to increase the heating capacity of the stove or furnace.

The invention consists in a stove or furnace having a shell provided with a fire-pot, transverse diaphragms arranged across the shell, a hollow partition arranged centrally between the diaphragms and forming a gas-chamber within it, said partition being separated from the shell by a space or iiue surrounding it and having at one end an opening affording communication between its inclosed chamber and said iiue, said gas-chamber communicating with a smoke-outlet and the flue surrounding said partition being adapted for communication with the fire-pot at the side of the shell opposite to the opening in the partition which aords communication between the iiue and the inclosed chamber.

The invention also consists in certain novel features of the construction,combination, and arrangement of the various parts of the improved stove or furnace wherebycertain important advantages are attained and the device is made simpler, cheaper, and otherwise better adapted and more convenient for use, all as will be hereinafter fully set forth.

The novel features of the invention will be carefully defined in the claims.

In order that the invention may be the better understood, we have shown in the accompanying drawings one embodiment thereof, in which drawings Figure 1 is a perspective View showing a stove or furnace constructed in accordance with our invention, and Fig. 2 is a vertical section taken axially through the same. Fig. 3 is a transverse section taken through the improved stove or furnace in the plane indicated by the line ct ot in Fig. 2. Fig. 4 is a transverse section taken through the improved stove or furnace in the plane indicated bythe line b h in Fig. 2. Fig. 5 is a fragmentary View showing the construction of the valve or chamber employed for controlling the direct passage from the fire-pot to the smoke-outlet.

The stove or furnace is constructed with a base comprising an annular lower portion 1, having legs 1a and a platform extending over said annular lower portion and provided with an upturned annular flange 2 surrounding it, the edge of said platform forming an annular iiange 3, projecting beyond the edges of the ring 1, on which flange 3 rests the shell 4 of the stove, which may be of any desired form in cross-section, being herein shown as elliptical and provided at its top with a closed cover 5, from the under side of which depends a centrally-arranged heat-spreading cone 6, as clearly shown in Fig. 2.

The front wall of the shell 4 is provided in its upper part with an Opening 7, serving as a charging-door, and this opening is adapted to be closed by a door 8, hinged at one side thereof and provided with a fastening device 9 of any preferred kind. The opening 7 leads into the fire-pot 10 of the stove, which is formed within a shell 1l, located within the shell 4 and by preference of the same form in cross-section, but of less diameter than said shell, as clearly shown in the sectional view Fig. 3.

The fire-pot 10 is provided at its lower part with a grate extending across the shell 11 and `serving to separate the fire-pot 10 from the `ash-chamber 20, located in said shell 11 beneath it.

Ato support and guide the forward portion of .the lower part 13 of the grate, we provide a guide-pin 15, depending from the under side Vof the upper part 12 of the grate, extending through a slot 16, formed in the lower portion of the grate. The lower end of the guide-pinV 15 carries a wearing-plate 18, on which the part 13 of the grate rests and plays.

The lower part 13 of the grate is provided Y IOO at its forward edge with a depending handle 19, by mea-ns of whichy it may be operated, and the front wall of the shell 4 and the wall of the inner shellll, adjacent thereto, are provided with openings forming a doorway leading into the ash-chamber 2O and affording access to the grate. The doorway is provided with a door 21, hinged at one side of the opening and provided with a register 23. to control the air supplied to the ire-potlO through the grate. The parts 12 and 13 of the grate are provided, respectively, with. series of ap.- ertures 12ad and 13a, arrangedI concentrically with the pivot pin 14 and adapted to be brought into and out of alinement with each other by the pivotal movement of said part 13 of the grate.

The inner shell 11 of thestove being of less diameter than the shell 4 and" being arranged.

thelower'endv4 of the iiue 23, but providedas` seen in Fig; 3,'with three openings-25, located attheback part and at the opposite sides of the stove and adapted for the passage of the products `ofcombustion passing down through theilfue 23.

Between the bottom; 24 of the inner-shell'll' and the platform at, the base ofthe stove is arranged a diaphragm 2.6, extendingtransversely and horizontally acrossV the shell 41 and` spaced apart bothl from the bottom 24 of the shell 1'1 an difrom the platform at the base of the stove: In the space between the diaphragm 26 andthe bottom 24 of the shell 11lis arrangedl a partition 26a, extending centrally inthe shellA 4 and serving to support., the rear'part of the shell 11, as will be readily through this opening the gases from the Iiues` 27' pass downwardly into the space betweenthe diaphragm 26 andA the platform atv the base-of the stove, as indicated bythe arrow'in Fig. 2L In the space beneath' the diaphragm 26'is=arranged a hollow partition 30, located under the rearpart of the shell 11, similarly totheY partition 26 above referred to, and-.the spaces on opposite sides of this partition 30 form` horizontal flues 29, extendingalong op-A posite sidesiof thestove at the base thereof. The-hollow ofthe partition 3Oforms'a` chamber31 to receive the gases passing through` theiues 292andl to permit the entryl of the The'rearwall ofv gases intol said chamber.

. shown in Figs. 2 and 4, and affording commu.- fnication between said chamber smoke-line of the stove, which is provlded and the with a horizontal lower portion 34, extending under the platform of the base rearwardly Afrom said opening 32 and communicating at the back of the stove with the vertical portiony 35, which leads to a iiange 36 for receiving the stovepi-pe. The front end of the horizontal portion 34 of this iiue is open and is provided with a door 37, having a handle 38. and held in place by spring-clips 39 or other suitable devices.

As shown in Figs 3 and' 4, the smoke-flue 35 extends outside the shell 4 of the stove andA is formedv separately therefrom,` having flanges at iis opposite sides which are riveted or otherwiseV secured' to' the outer surface of said shell. The walls of the shell 4 and'` the smoke-flue' 3.5 are provided near the top of said flue with an opening 40,. adapted to be closed by a damper orv valve 41', carried" on the end` of a slide-rod 42, movable transverselyacross the flue 35 and serving to permit the passage of the products of combustion directly from the lire-pot tov the upper part of said smoke-flue.. \j\

In the operation of the improved stove on furnace it will be seen that when the iire is kindled in the fire-pot the draft-opening 40 may be opened, so asto increase the draft by aording direct communication tothe fire-pot and the chimney, and after the fl'reis burning, saidI draft will be closed, so as to cause the products of combustion to pass down by way ofthe flue 23, through the opening 25 in the flange 24, and into the flues 27 at opposite sides of the, stove, whence the heated gases pass down andin the oppositedirection through the flues 29,. immediately beneath the lines 27, and enter the chamber31 at the base of the stove. From this chamber the gases pass by way of the opening32 down into the horizontal portion 34 of the smoke-flue andi up through the vertical` portion 35 thereof andv escapev to the chimney. In this way it wllibeseen that the heated gases from the 're-pot are caused'to circulate back and forth through the flues at the lower portion ofthe stove, so that a considerable heat will beim.- partedv tothe walls ofk the flues and will be radiated therefrom, and it will be evident that, when desired-, .the'flues at the lower por- IOO IIO

tion of the stove may be provided with jackets, such as arev commonly provided in furnaces for heating purposes. The arrangement of the horizontal portion 34 of the smoke-flue with4 its open end permits said flue to bev thoroughly cleaned, when' desired, in order that the draft through the same shall not beimpaired, and for'the same reason-the-ffront wall of4` theA shell 4 is'provid'ed at its lower part with a door 43, as shown in Fig. 2, to permit access to the horizontal lines 27 and 29.

From the above description it will be seen that our improved stove or furnace is of an exceedingly simple and inexpensive nature and is especially well adapted for use for heating purposes, and it will be seen that the invention is susceptible of certain modifications without material departure from its principles and spirit, and for this reason we do not wish to be understood as limiting ourselves to the precise form and arrangement of the parts herein set'forth.

Having thus described our invention,what we clairn.is-

1. A stove or furnace having a shell provided with a fire-pot and smoke-outlet, transverse diaphragms arranged across the shell, a hollow partition arranged centrally between the diaphragms and forming a gas-chamber within it, said partition being surrounded by a flue separating it from the shell and having at one end an opening affording communication between its inclosed chamber and said iue, said chamber being adapted for communication with the smoke-outlet and the flue surrounding the partition being adapted for communication with the fire-pot at theside of the shell opposite to the opening in the partition which affords communication between the flue and the inclosed chamber, substantially as set forth.

2. In a stove or furnace, the combination of an outer shell, an inner, fire-box shell, closed at its bottom by a diaphragm, and arranged within said outer shell to form therewith, and in connection with said diaphragm, a downdraft-flue, two horizontal flues situated between said diaphragm and the stove-bottom, and connected one to the other, to form a return circuitous course for the heat and products of combustion below the fire-pot, one of said horizontal flues communicating directly with the downdraft-flue, and a smokeoutlet connected to the other horizontal flue, as and for the purposes described.

3. In a stove or furnace, the combination of an outer shell, an inner re pot shell closed at its bottom by a diaphragm and situated within the outer shell to form in connection therewith, and with said diaphragm, a vertical downdraft-lue, a grate within the fire-pot shell and above the diaphragm thereof, another diaphragm 26 situated between the stove-bottom and the fire-pot diaphragm and forming, above and below said diaphragm 26, horizontal return-flues situated in different horizontal planes, and partitioned to conduct the heat or products of combustion back and forth horizontally beneath the fire-pot, the upper horizontal iiue communicating directly with the downdraft-lue between said shells, and a smoke-outlet extending beneath the stove-bottom and connected directly with the lower horizontal flue, las and for the purposes described.

4. In a stove or furnace, the combination of two shells arranged one within and of less cross-sectional area than the other, the walls of the shells being spaced apart to form a iue between them, and the inner shell being provided with a closed bottom which projects beyond the inner shell and forms a flange extending across the liue around the inner shell, said iiange having perforations, a grate dividing the inner shell into a lire-pot and an ash-chamber, the shells having openings leading into the fire-pot and ash-chamber, a dia-4 phragm extending across the outer shell beneath the ash-chamber and forming between it and the bottom of the inner shell a space, a partition dividing said space into two horizontal ilues, each communicating at one end with the flue surrounding the inner shell and having its other end adapted for communication with a smoke-outlet, substantially as set forth.

5. In a stove or furnace, the combination of two shells arranged one within the other and separated by a downwardly-extending flue, the inner shell having a grate and forming a fire-pot, diaphragms below the fire-pot, a hollow partition arranged centrally between the diaphragms and forming a gas-chamber within it, said partition being surrounded by a iiue'and having at one end an opening affording communication between its inclosed chamber and said ilue, said iue being adapted IOO iue extending vertically of the shell and having its lower end extending horizontally beneath and adapted for communication with the gas-chamber in said hollow partition, substantially as set forth.

6. In a stove or furnace, the combination with an outer shell, and an inner fire-pot shell, closed at its bottom by a diaphragm-and forming a downdraft-ue, of the diaphragm 26 situated between the lire-pot diaphragm and the stove-bottom, a partition between the fire-pot diaphragm and the diaphragm 26, to form a horizontal iiue that connects directly with the downdraft-flue, another partition situated between the diaphragm 26 and the stove-bottom and recurved upon itself to form another horizontal flue which extends between, and outside of, said partition so as to receive heat and products of combustion from the firstnamed horizontal flue and to discharge the same to an outlet 32, and a smoke -flue to which the `outlet 32 discharges, as and for the purpose described.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures in the presence of two witnesses.

AUGUST ENGSTRAND. ALFRED D. SUNDEEN. JACOB O. POPE. ROGER W. SAFFORD.

Witnesses:

M. E. RUTHERFORD, HANS PnTnRsoN.

IIO 

